#pragma once
#include<iostream>
#include<assert.h>

namespace bit{
	
	class string
	{
	public:
		
		
		typedef char* iterator;
		typedef const char* const_iterator;

		iterator begin();
		iterator end();
		const_iterator begin() const;
		const_iterator end() const;

		string(const char* str = "");
		string(const string& s);
		string& operator=(const string& s);
		~string();


		size_t size()const;
		size_t capacity()const;

		const char* c_str()const;
		char& operator[](size_t pos);
		const char& operator[](size_t pos)const;
		void resereve(size_t newsize);
		void push_back(char ch);
		void append(const char* str);

		string& operator+=(char ch);
		string& operator+=(const char* str);

		void insert(size_t pos, char ch);
		void insert(size_t pos, const char* str);
		void erase(size_t pos = 0, size_t len = npos);

		size_t find(char ch, size_t pos = 0);
		size_t find(const char* str, size_t pos = 0);

		void swap(string& s);
		string substr(size_t pos = 0, size_t len = npos);

		bool operator<(const string& s) const;
		bool operator>(const string& s) const;
		bool operator<=(const string& s) const;
		bool operator>=(const string& s) const;
		bool operator==(const string& s) const;
		bool operator!=(const string& s) const;
		void clear();

	private:
		char* _str;
		size_t _size;
		size_t _capacity;
		
		const static size_t npos;
	};

	std::istream& operator>> (std:: istream& is, string& str);
	std::ostream& operator<< (std::ostream& os, const string& str);
}

